/* CoralCube | Massively Multiplayer Online Role-Playing Game(MMORPG) Emulator.
|* 
|* Copyright (C) 2005-2010 MaNGOS <http://getmangos.com/>
|*               2008-2010 TrinityCore <http://www.trinitycore.org/>
|*               2008-2010 CoralCube <http://www.CoralCube.com/>
|*
|* This program is free software. You can redistribute it and/or modify it under the terms of 
|* the GNU General Public License as published by the Free Software Foundation, either 
|* version 2 of the License.
|*
|* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY, 
|* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
|* See the GNU General Public License for more details.
|*
|* You should have received a copy of the GNU General Public License along with this program. 
|* If not, see <http://www.gnu.org/licenses/>.
|*/

#include "HMACSHA1.h"
#include "BigNumber.h"

HmacHash::HmacHash(uint32 len, uint8 *seed)
{
    HMAC_CTX_init(&m_ctx);
    HMAC_Init_ex(&m_ctx, seed, len, EVP_sha1(), NULL);
}

HmacHash::~HmacHash()
{
    HMAC_CTX_cleanup(&m_ctx);
}

void HmacHash::UpdateBigNumber(BigNumber *bn)
{
    UpdateData(bn->AsByteArray(), bn->GetNumBytes());
}

void HmacHash::UpdateData(const uint8 *data, int length)
{
    HMAC_Update(&m_ctx, data, length);
}

void HmacHash::UpdateData(const std::string &str)
{
    UpdateData((uint8 const*)str.c_str(), str.length());
}

void HmacHash::Finalize()
{
    uint32 length = 0;
    HMAC_Final(&m_ctx, (uint8*)m_digest, &length);
    ASSERT(length == SHA_DIGEST_LENGTH)
}

uint8 *HmacHash::ComputeHash(BigNumber *bn)
{
    HMAC_Update(&m_ctx, bn->AsByteArray(), bn->GetNumBytes());
    Finalize();
    return (uint8*)m_digest;
}
